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The tire pressure works by pressure not by revolutions. Also a deflated tire will spin just as many revolutions as an inflated tire per a given distance.
As for using 15" wheels on a a vehicle that came with 16"er's, it makes no difference as long as the outter tire diameter is the same. You could even go to a 14" wheel or even larger wheels. Being that the trick is to make sure you have the proper tire diamater, make sure to check the tire height. If I were switching, I'd look for a tire that might be ever so lightly larger to try and reduce the miles that appear on the odo. But remember, with larger tires, you'll lose acceleration, with smaller tire, its the opposite. Also, you might have problems with the shift points on your tranny. Most systems are setup to shift at a given rpm.
BTW, if you do change tire sizes, you might want to check with Toyota about having your speedo recalibrated. It might be as easy as them using a scan tool to change the # of revolutions per miles or you might need to change out a gear for the speedo. The odds are it's just using a scan tool. Doing this will not only show you the correct speed, it'll make sure that your tranny shifts correctly.
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